EP0652425A2 - Dispositif pour évaluer la compression d'un moteur à combustion à plusieurs cylindres - Google Patents

Dispositif pour évaluer la compression d'un moteur à combustion à plusieurs cylindres Download PDF

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Publication number
EP0652425A2
EP0652425A2 EP94115852A EP94115852A EP0652425A2 EP 0652425 A2 EP0652425 A2 EP 0652425A2 EP 94115852 A EP94115852 A EP 94115852A EP 94115852 A EP94115852 A EP 94115852A EP 0652425 A2 EP0652425 A2 EP 0652425A2
Authority
EP
European Patent Office
Prior art keywords
cylinder
maximum
pressure
cylinders
starter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94115852A
Other languages
German (de)
English (en)
Other versions
EP0652425B1 (fr
EP0652425A3 (fr
Inventor
Günter Russler
Rudolf Schmiedl
Elmar Schöllhorn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0652425A2 publication Critical patent/EP0652425A2/fr
Publication of EP0652425A3 publication Critical patent/EP0652425A3/fr
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Publication of EP0652425B1 publication Critical patent/EP0652425B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/04—Testing internal-combustion engines
    • G01M15/042—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
    • F02D35/023—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure
    • F02D35/024—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure using an estimation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
    • G01L23/08—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically
    • G01L23/085—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically by measuring fluctuations of starter motor current or of battery voltage
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/04—Testing internal-combustion engines
    • G01M15/08—Testing internal-combustion engines by monitoring pressure in cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
    • F02D35/023—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure

Definitions

  • the invention relates to a device for evaluating the compression of each cylinder of a multi-cylinder internal combustion engine in motor vehicles according to the preamble of patent claim 1.
  • a device for example from DE-OS 25 09 199.
  • a measuring device is provided for detecting a signal proportional to the starter current of an electric starter. This signal is fed to an evaluation unit, which in each case detects a maximum amplitude value at predetermined time intervals and compares each maximum amplitude value with the highest of these maximum amplitude values. If one of the maximum amplitude values differs from the highest of the maximum amplitude values by more than a predetermined deviation, a warning display is activated by the evaluation unit.
  • this known device only relative compression differences between the individual cylinders are displayed, so that only a single defective cylinder, but not a general deterioration of all cylinders, is recognized.
  • each cylinder has its own measuring chamber for measuring the cylinder pressure between the cylinder head and the cylinder block.
  • a pressure measuring device for each cylinder is complex and cost-intensive.
  • a second measuring device in the form of a pressure sensor for detecting the cylinder pressure, preferably a single cylinder, is connected to the evaluation unit to which a first measuring device for detecting a signal proportional to the starter current is connected.
  • the evaluation unit determines a proportionality factor from the detected maximum cylinder pressure value and the maximum amplitude value of the signal proportional to the starter current, which is detected simultaneously with the maximum cylinder pressure value.
  • the maximum cylinder pressure values of the cylinders not provided with a pressure sensor are calculated from the maximum amplitude values of the signal proportional to the starter current, which follow the maximum amplitude value which occurs and is detected simultaneously with the maximum cylinder pressure value.
  • the starting process for evaluating the signal proportional to the starter current is carried out, for example, by closing the ignition switch.
  • Known measures are taken, for example, to prevent the engine from actually starting. After the evaluation, make sure that the fault memory of a self-diagnosable engine control unit is deleted is because the engine control unit may recognize and save errors during this prevented starting process.
  • the amplitude values of the signal proportional to the starter current are calibrated with respect to an absolute cylinder pressure value.
  • a cylinder pressure value can thus be assigned to each amplitude value of the signal proportional to the starter current. Since, as is known, a maximum amplitude value of the signal proportional to the starter current occurs with each compression of a cylinder, the device according to the invention can be used to assign a maximum cylinder on the one hand to a specific cylinder and, on the other hand, an absolute cylinder pressure. By measuring a single cylinder pressure, the cylinder pressure values of all other cylinders can be calculated. This enables a very precise and simple absolute evaluation of the compression of each cylinder.
  • an automatic detection of the number of cylinders is possible with the device according to the invention. Furthermore, e.g. given a combination of the device according to the invention with a camshaft sensor system, there is an evaluation of the compression of the cylinders with automatic cylinder recognition.
  • a further advantageous embodiment of the invention is the subject of claim 3.
  • the starting process is artificially maintained until a constant speed of the starter motor has been set. Only then does the calculation of the maximum cylinder pressure values or the evaluation of the compression of the individual cylinders begin. With this embodiment according to the invention, it is prevented that maximum amplitude values, which change as a result of speed fluctuations in the starter motor, are incorrectly used to infer compression differences between the cylinders.
  • a further advantageous embodiment of the invention is the subject of claim 4.
  • the starting process is not carried out by closing the ignition lock switch, but by any other test starting device when the ignition lock switch is connected to a switch-on input of a control unit.
  • This configuration according to the invention prevents the engine from actually starting or, for example, that an engine control unit equipped with a diagnostic program inadvertently stores an error in the error memory due to the artificially extended starting process.
  • a spark plug 6, 7 and 8 is arranged in the combustion chambers of cylinders 2, 3 and 4 as usual for igniting the fuel-air mixture.
  • a pressure sensor 5 is arranged in the combustion chamber of the cylinder 1 instead of a spark plug.
  • a line leads from the pressure sensor 5 to an input of an evaluation unit 10. This line supplies a signal p proportional to the pressure detected by the pressure sensor 5.
  • Another input signal of the evaluation unit 10 is a signal I A proportional to the starter current of a starter, not shown here.
  • the electric starter is usually an electric motor that rotates the internal combustion engine via a pinion that engages in the flywheel of the internal combustion engine. For each compression stroke of a cylinder, the torque required for the starter to continue turning the internal combustion engine increases. This results in maximum amplitude values for the starter current for each compression stroke of a cylinder, in order to continue rotating the starter and thus the internal combustion engine at a constant speed despite increased torque. These maximum amplitude values of the starter current or the signal proportional to this starter current are in turn proportional to the cylinder pressure during a compression stroke. The cylinder pressure during a compression stroke is in turn proportional to the compression quality of a cylinder.
  • the evaluation unit 10 measures the maximum cylinder pressure value during the compression stroke of the first cylinder 1 p 1 and at the same time the maximum amplitude value I 1 of the signal I A proportional to the starter current.
  • the proportionality factor K is determined from the ratio of the first maximum amplitude value I 1 to the measured maximum cylinder pressure value P 1.
  • the pressure values p1, p2, p3, p4 of the cylinders 1, 2, 3 and 4 can be shown.
  • FIG. 2 shows the course of a signal I A proportional to the starter current over time t.
  • the course of this signal has four repetitive amplitudes A1 to A4, the amplitude A3 having a maximum amplitude value I3, which is significantly smaller than the maximum amplitude values I1, I2 and I4.
  • a cylinder has a deteriorated compression compared to the other cylinders, but it is neither apparent which cylinder is to be assigned to the maximum amplitude value I3 nor which absolute cylinder pressure corresponds to this maximum amplitude value I3.
  • FIG. 2 only a relative statement about the compression of the individual cylinders is possible.
  • This exact cylinder and cylinder pressure assignment is according to the invention by the pressure sensor 5 in the cylinder 1 and possible in connection with the known firing order.
  • 3 shows the profile of the cylinder pressure p of the cylinder pressure p detected by the pressure sensor 5 in the cylinder 1.
  • the maximum pressure value of the amplitude P1 is the cylinder maximum pressure value p1.
  • t2 to t4 ie during the compression strokes of cylinders 2 to 4, only the amplitudes A2 to A4 of the signal I A proportional to the starter current occur.
  • the amplitude A1 and the amplitudes A2 to A4 can be assigned to the cylinder 1 to the following cylinders 2 to 4.
  • a proportionality factor K can be determined from the amplitude maximum value I 1 assigned to the amplitude A1 and the cylinder maximum pressure value p 1 of the amplitude P1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
EP94115852A 1993-11-05 1994-10-07 Dispositif pour évaluer la compression d'un moteur à combustion à plusieurs cylindres avec pince de courant de starter et capteur de pression Expired - Lifetime EP0652425B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4337720A DE4337720A1 (de) 1993-11-05 1993-11-05 Vorrichtung zur Auswertung der Verdichtung eines mehrzylindrigen Verbrennungsmotors
DE4337720 1993-11-05

Publications (3)

Publication Number Publication Date
EP0652425A2 true EP0652425A2 (fr) 1995-05-10
EP0652425A3 EP0652425A3 (fr) 1996-01-10
EP0652425B1 EP0652425B1 (fr) 1998-06-10

Family

ID=6501834

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94115852A Expired - Lifetime EP0652425B1 (fr) 1993-11-05 1994-10-07 Dispositif pour évaluer la compression d'un moteur à combustion à plusieurs cylindres avec pince de courant de starter et capteur de pression

Country Status (2)

Country Link
EP (1) EP0652425B1 (fr)
DE (2) DE4337720A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006008062B3 (de) * 2006-02-21 2007-05-10 Siemens Ag Motorsteuerung und Verfahren zur Bestimmung des Drucks in einem Brennraum einer Brennkraftmaschine
DE102006020434A1 (de) * 2006-05-03 2007-11-08 Bayerische Motoren Werke Ag Kraftfahrzeug und Kompressionsdruckprüfvorrichtung
DE102004046083B4 (de) * 2004-09-23 2016-03-17 Robert Bosch Gmbh Verfahren und Vorrichtung zur Steuerung einer Brennkraftmaschine
DE10302058B4 (de) * 2003-01-21 2016-11-10 Robert Bosch Gmbh Verfahren zum Betreiben einer Brennkraftmaschine
RU2626282C2 (ru) * 2015-05-12 2017-07-25 Федеральное государственное казённое военное образовательное учреждение высшего профессионального образования "Рязанское высшее воздушно-десантное командное училище (военный институт) имени генерала армии В.Ф. Маргелова" Анализатор работы систем двигателя внутреннего сгорания

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19734680B4 (de) * 1996-08-16 2008-09-04 Conti Temic Microelectronic Gmbh Verfahren zur zylinderselektiven Dichtigkeitsprüfung der Brennräume von Brennkraftmaschinen
DE10025846B8 (de) 2000-05-25 2007-09-20 Conti Temic Microelectronic Gmbh Verfahren zur zylinderselektiven Dichtigkeitsprüfung der Brennräume einer Brennkraftmaschine
DE102011001299B4 (de) * 2011-03-16 2015-06-25 L'orange Gmbh Verfahren zur Funktionsüberprüfung von Hubkolben-Brennkraftmaschinen, insbesondere Diesel-Brennkraftmaschinen

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2140172A1 (de) * 1971-08-11 1973-02-22 Bosch Gmbh Robert Verfahren und einrichtung zur ueberpruefung von brennkraftmaschinen
US3765233A (en) * 1971-01-26 1973-10-16 List H Device for measuring compression of piston engines
FR2369556A1 (fr) * 1976-10-26 1978-05-26 Megasystems Inc Appareil de mesure de puissance des moteurs a pistons
DE2709128B1 (de) * 1977-03-02 1978-08-17 Siemens Ag Verfahren zur Ermittlung eines der Kompression einer Brennkraftmaschine proportionalen Messwertes
JPS57188729A (en) * 1981-04-22 1982-11-19 Hitachi Zosen Corp Compression pressure detecting method for internal combustion engine
EP0269606A2 (fr) * 1986-11-25 1988-06-01 AVL Gesellschaft für Verbrennungskraftmaschinen und Messtechnik mbH.Prof.Dr.Dr.h.c. Hans List Méthode et dispositif pour le contrôle d'un moteur à combustion interne
JPH01113630A (ja) * 1987-10-27 1989-05-02 Fuji Heavy Ind Ltd 筒内圧センサの自動検定装置
JPH02147934A (ja) * 1988-11-30 1990-06-06 Hino Motors Ltd エンジンの最大燃焼圧測定装置

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
DE2207789C3 (de) * 1972-02-18 1975-04-10 Siemens Ag, 1000 Berlin Und 8000 Muenchen Schaltungsanordnung für die elektrische Messung der Kompression von Kolbenmotoren
SE380348B (sv) * 1974-03-04 1975-11-03 Svensk Bilprovning Ab Anordning for indikering av relativa kompressionsskillnader hos en flercylindrig forbrenningsmotor
US3952586A (en) * 1975-06-19 1976-04-27 Rca Corporation Determining engine compression from starter motor current
US4126037A (en) * 1977-11-17 1978-11-21 Rca Corporation Compression test using battery voltage waveform during cranking
US4309900A (en) * 1980-04-18 1982-01-12 Sun Electric Corporation Apparatus for measurement and display of relative compression by cylinder
US4633707A (en) * 1982-09-13 1987-01-06 Jodon Engineering Associates, Inc. Method and apparatus for measuring engine compression ratio, clearance volume and related cylinder parameters
JP3763087B2 (ja) * 1997-06-19 2006-04-05 応研精工株式会社 ダイヤフラムポンプ

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3765233A (en) * 1971-01-26 1973-10-16 List H Device for measuring compression of piston engines
DE2140172A1 (de) * 1971-08-11 1973-02-22 Bosch Gmbh Robert Verfahren und einrichtung zur ueberpruefung von brennkraftmaschinen
FR2369556A1 (fr) * 1976-10-26 1978-05-26 Megasystems Inc Appareil de mesure de puissance des moteurs a pistons
DE2709128B1 (de) * 1977-03-02 1978-08-17 Siemens Ag Verfahren zur Ermittlung eines der Kompression einer Brennkraftmaschine proportionalen Messwertes
JPS57188729A (en) * 1981-04-22 1982-11-19 Hitachi Zosen Corp Compression pressure detecting method for internal combustion engine
EP0269606A2 (fr) * 1986-11-25 1988-06-01 AVL Gesellschaft für Verbrennungskraftmaschinen und Messtechnik mbH.Prof.Dr.Dr.h.c. Hans List Méthode et dispositif pour le contrôle d'un moteur à combustion interne
JPH01113630A (ja) * 1987-10-27 1989-05-02 Fuji Heavy Ind Ltd 筒内圧センサの自動検定装置
JPH02147934A (ja) * 1988-11-30 1990-06-06 Hino Motors Ltd エンジンの最大燃焼圧測定装置

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 13 no. 353 (P-913) ,8.August 1989 & JP-A-01 113630 (FUJI HEAVY IND LTD) 2.Mai 1989, *
PATENT ABSTRACTS OF JAPAN vol. 14 no. 392 (P-1096) ,23.August 1990 & JP-A-02 147934 (HINO MOTORS LTD.) 6.Juni 1990, *
PATENT ABSTRACTS OF JAPAN vol. 7 no. 37 (M-193) [1182] ,15.Februar 1983 & JP-A-57 188729 (HITACHI ZOSEN KK.) 19.November 1982, *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10302058B4 (de) * 2003-01-21 2016-11-10 Robert Bosch Gmbh Verfahren zum Betreiben einer Brennkraftmaschine
DE102004046083B4 (de) * 2004-09-23 2016-03-17 Robert Bosch Gmbh Verfahren und Vorrichtung zur Steuerung einer Brennkraftmaschine
DE102006008062B3 (de) * 2006-02-21 2007-05-10 Siemens Ag Motorsteuerung und Verfahren zur Bestimmung des Drucks in einem Brennraum einer Brennkraftmaschine
US7962273B2 (en) 2006-02-21 2011-06-14 Continental Automotive Gmbh Engine control and method for determining the pressure in a combustion chamber of an internal combustion engine
DE102006020434A1 (de) * 2006-05-03 2007-11-08 Bayerische Motoren Werke Ag Kraftfahrzeug und Kompressionsdruckprüfvorrichtung
RU2626282C2 (ru) * 2015-05-12 2017-07-25 Федеральное государственное казённое военное образовательное учреждение высшего профессионального образования "Рязанское высшее воздушно-десантное командное училище (военный институт) имени генерала армии В.Ф. Маргелова" Анализатор работы систем двигателя внутреннего сгорания

Also Published As

Publication number Publication date
DE4337720A1 (de) 1995-05-18
EP0652425B1 (fr) 1998-06-10
EP0652425A3 (fr) 1996-01-10
DE59406196D1 (de) 1998-07-16

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